This is a note to let you know that I've just added the patch titled
usb: typec: bus: verify partner exists in typec_altmode_attention
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-typec-bus-verify-partner-exists-in-typec_altmode_attention.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f23643306430f86e2f413ee2b986e0773e79da31 Mon Sep 17 00:00:00 2001
From: RD Babiera <rdbabiera@xxxxxxxxxx>
Date: Mon, 14 Aug 2023 18:05:59 +0000
Subject: usb: typec: bus: verify partner exists in typec_altmode_attention
From: RD Babiera <rdbabiera@xxxxxxxxxx>
commit f23643306430f86e2f413ee2b986e0773e79da31 upstream.
Some usb hubs will negotiate DisplayPort Alt mode with the device
but will then negotiate a data role swap after entering the alt
mode. The data role swap causes the device to unregister all alt
modes, however the usb hub will still send Attention messages
even after failing to reregister the Alt Mode. type_altmode_attention
currently does not verify whether or not a device's altmode partner
exists, which results in a NULL pointer error when dereferencing
the typec_altmode and typec_altmode_ops belonging to the altmode
partner.
Verify the presence of a device's altmode partner before sending
the Attention message to the Alt Mode driver.
Fixes: 8a37d87d72f0 ("usb: typec: Bus type for alternate modes")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: RD Babiera <rdbabiera@xxxxxxxxxx>
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230814180559.923475-1-rdbabiera@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/typec/bus.c | 12 ++++++++++--
drivers/usb/typec/tcpm/tcpm.c | 3 ++-
include/linux/usb/typec_altmode.h | 2 +-
3 files changed, 13 insertions(+), 4 deletions(-)
--- a/drivers/usb/typec/bus.c
+++ b/drivers/usb/typec/bus.c
@@ -154,12 +154,20 @@ EXPORT_SYMBOL_GPL(typec_altmode_exit);
*
* Notifies the partner of @adev about Attention command.
*/
-void typec_altmode_attention(struct typec_altmode *adev, u32 vdo)
+int typec_altmode_attention(struct typec_altmode *adev, u32 vdo)
{
- struct typec_altmode *pdev = &to_altmode(adev)->partner->adev;
+ struct altmode *partner = to_altmode(adev)->partner;
+ struct typec_altmode *pdev;
+
+ if (!partner)
+ return -ENODEV;
+
+ pdev = &partner->adev;
if (pdev->ops && pdev->ops->attention)
pdev->ops->attention(pdev, vdo);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(typec_altmode_attention);
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -1863,7 +1863,8 @@ static void tcpm_handle_vdm_request(stru
}
break;
case ADEV_ATTENTION:
- typec_altmode_attention(adev, p[1]);
+ if (typec_altmode_attention(adev, p[1]))
+ tcpm_log(port, "typec_altmode_attention no port partner altmode");
break;
}
}
--- a/include/linux/usb/typec_altmode.h
+++ b/include/linux/usb/typec_altmode.h
@@ -67,7 +67,7 @@ struct typec_altmode_ops {
int typec_altmode_enter(struct typec_altmode *altmode, u32 *vdo);
int typec_altmode_exit(struct typec_altmode *altmode);
-void typec_altmode_attention(struct typec_altmode *altmode, u32 vdo);
+int typec_altmode_attention(struct typec_altmode *altmode, u32 vdo);
int typec_altmode_vdm(struct typec_altmode *altmode,
const u32 header, const u32 *vdo, int count);
int typec_altmode_notify(struct typec_altmode *altmode, unsigned long conf,
Patches currently in stable-queue which might be from rdbabiera@xxxxxxxxxx are
queue-5.15/usb-typec-bus-verify-partner-exists-in-typec_altmode_attention.patch
queue-5.15/usb-typec-tcpm-set-initial-svdm-version-based-on-pd-revision.patch
